Occasionally, after I've been working on a painting for a while, I get the urge to just erase everything and start over. I try not to do this too often, as it makes all the work I've already done a complete waste of energy. Sometimes though, it becomes obvious that whatever inspiration I started with has long since passed, and it's not going to do anyone any good to keep trying to save it. Inevitably, the painting becomes a dark, muddy, mass of nothing. So, I like to paint it all white again, which gives me a new start.
This is the set of 4 12x12's that I began a few months ago. I'm already happier with them.